We did a pre-extension trip to Prague as part of our Viking River Cruise. So worth it. Luxury hotel, great shuttle service to old town. Helpful Viking staff available. City tour included. Prague is a beautiful city! I would love to go back. So much to see! We went a Christmas, so were able to enjoy the lovely Christmas markets and the old town square decorated. Other great sites are the Charles Bridge, Klementium Library and tour, Clock Tower, and Prague Castle. We did an extension tour of Lobkowitcz Palace. Interesting history, but not exactly what we anticipated. No actual tour of the Palace, but more an art gallery. Wish we had time to go to Stahov Monastery for the view and the beer. Next time.